Add an elementwise array addition formula #3749
Description
There are formulas for multiplying and dividing arrays by a scalar or elementwise with another array but there is only a scalar formula for addition.
| Operation | Scalar | Elementwise |
|---|---|---|
| Addition | arraySum | ? |
| Multiplication | scale | arrayMult |
| Division | arrayDivScalar | arrayDiv |
The naming scheme of the division formulas won't work here so maybe the new formula could be called "arrayAdd".